uxcell SN04-N 4mm Approach Sensor DC 10-30V 3-wire Inductive Proximity Switch NPN NO Product Name : Proximity Sensor Switch;Model : SN04-N;Type : NPN No;Theory : Inductance Sensor;Switch Appearance Type:Rectangle Type Output : Switching Transducer;Sensing Distance : 4mm (+/-10%);Working Voltage : DC 10-30V;Wire Type:3-Wire Response Frequency : 500Hz max;Indicator : Red LED;Size : 1.8 x1.8 x 3.3cm/0.7" x 0.7" x 1.3"(W*H*L) Cable Length : 126cm/49.6";Hole Size : 0.8 x 0.3cm/0.3" x 0.1"(L*W);Extenal Material : ABS Resin Net Weight : 41g;Color : Black, Green;Package Content : 1 x Proximity Sensor Switch,2 x Screws